Improvement in steam-boiler furnaces



n. P. BEARD.

Steam-Boiler Furnace.

Patented May 11, 1875.

gay-m THE GRAPHIC C0.PHOT0-LITH.39&4'| PARK PLACLNBK I to the end of flue c.

NITED S'mrns ATEN'I' Orrro DAVID P. BEARD, OF ST. LOUIS, MISSOURI, ASSIGNOR OF ONE-HALF HIS RIGHT TO PATRICK G. ROONEY.

IMPROVEMENT IN STEAM-BOILER FURNACES.

Specification forming part of Letters Patent No. 163,137, dated May 11, 1875; application filed December 12, 1874.

To all whom it may concern:

Be it known that I, DAVID P. BEARD, of St. Louis, St. Louis county, Missouri, haveinvented an Improvement in Steam-Boiler Furnaces, of Which the following is a specification:

My invention is designed as an improvement upon the steam-boiler furnace for which Letters Patent of the United States No. 53,367 were issued to Joseph H. Webster March 20, 1866; and. my invention consists, first, in 'a certain peculiar relative arrangement of the boiler-flue, smoke-stack, and tube, which returns the gases, 850., to the fire-box, by which the current from the boiler-flue is naturally directed to the return-tube before it is turned in the direction of the chimney, and the use of steam, heretofore largely employed to direct said current, thereby dispensed with in a great measure for this use, and used only to regulate the velocity of the return current, and unite with the current in the return-tube to facilitate the combustion of gases in the fluechamber. My invention further consists of an adjustable device in connection with the return-tube, by which the discharge of gases to the chimney and the return-flue to the firebox, relatively, may be varied to achieve the maximum of efficiency in smoke prevention.

Theaocompanyingdrawingshowsasectional elevation of the boiler with my improvement attached.

A is the boiler, having the ordinary flue or flues a, steam-dome a, and satiety-valve a.

The boiler rests, as usual, in masonry, so formed that the heat-conducting space B leading from the grate-bars to the farthest end of the boiler expands into a combustion-chamber, 0, having doors 0 to provide for cleaning. It also has, preferably, an induction-vent, D, for cold air from the space under the fire-grate E. F is the breeching of the smokestack G.

The boiler, formed and set as described, or in any other preferred way, is furnished with my improvement, as follows: H is the return smoke-tube, the part h of which projects preferably anglewise into the fire-box, while the bell-shaped mouth h rests inside or adjacent By this arrangement of gases, naturally directed stack G from the gratetubes the current of by the draft of the bars E through combustion-chamber O, passage B, and flue or flues a to the mouth or bell-shapedopening h, is separated into two currents, the one passing out into the chimney, and the other, collected by the flaring mouth h of said pipe, passes through the part 71. into the fire-chamber E. It is therefore obvious that a great part of the heated gases and floating particles of combustion directed to the chimney is, while moving in that direction, openly and directly received by the bell-mouth of pipe H, which directs it to the tire-chamber to support combustion and materially aid in the prevention of smoke and saving in fuel. the tube H with its mouth directly in line for the reception of gases, the great quantity of steam used in the Webster device to so deflect the currents as to enable a part to enter the return smoke'flue is saved. The steam introduced in my device is used in very limited quantities, and only for the purpose ofincreasing the force of the return current and aiding in the prevention of smoke. The currents, divided as above described at the mouth of pipe H, can be of unequal bulk, depending proportionately upon the relative positions of the end of flue a, and a sliding or adjustable annular damper, I, fitting around tube H. By the adjustment of this damper the right dis tribution of said unequal currents to achieve the maximum of effioiencyin smoke consumption may be attained. Pipe J introduces the jet of steam from the boiler A, which is regulated by cook The pipe J, at its discharging end, is inclosed within the tube H, so that its escaping force will, by the injector principle, serve in the highest degree to keep up the current through pipe H with but little use of steam. I claim-- 1. In. a boiler of the character stated, the return-flue H, arranged with its mouth h facing the flue or flues a of the boiler, substantially as and for the purpose specified.

2. In combination with the return-flue H h and boiler-flue or lines a, the adjustable plate I, operating substantially as and for the purpose specified.

In testimony of which invention I hereunto set my hand.

DAVID P. BEARD. Witnesses:

EDGAR J. GRoss, J. L. WARTMANN.

By reason of the location of I 

